Powerware 650825 kVA operation manual UPS System Overview, Battery System, UPS Cabinet

Chapter 6 Understanding UPS Operation

6.1UPS System Overview

The Powerware 9395 UPS is a continuous−duty, solid-state, transformerless (at 480 Vac), three−phase, true online system that provides conditioned and uninterruptible AC power to the UPS system’s output and critical load.

The basic system consists of a rectifier, battery converter, inverter, monitoring/operation control panel, integrated communication server, and digital signal processor (DSP) logic. Figure 6-1shows the main elements of the UPS system.

Battery

Battery System	Battery
	Breaker

AC Input to Rectifier/ Charger

AC Input to Bypass

Battery

Contactor

K2

Battery

Converter

Input
Breaker	Input
CB1	Contactor
(optional)	K1
	Rectifier

Digital

Metering

Static

Switch

Output

Contactor

K3

Inverter

Power Module

Backfeed

Protection

Contactor

K5

AC Output to Critical Load

Bypass Breaker (CB4)

UPS Cabinet

NOTE On an UPS configured as an Input Output Module (IOM), the bypass input, static switch, bypass breaker (CB4), and backfeed protection contactor (K5) are not present.

Figure 6-1. Main Elements of the UPS System

If utility power is interrupted or falls outside the parameters specified in Chapter 10, backup battery supply to maintain power to

the critical load for a specified period of time or until the utility power returns. For extended power outages, the UPS allows you to either transfer to an alternative power system (such as a generator) or shut down your critical load in an orderly manner.

EATON Powerware® 9395 UPS (650–825 kVA) Installation and Operation Manual S 164201725 Rev 2 www.powerware.com 6−1